implemented a customizable chat background system with support for patterns, solid colors, and gallery images; added a dedicated settings page with live preview and adjustable blur/dim effects, updated the image cropper to support flexible aspect ratios for wallpapers, and integrated file cleanup logic during account logout.

lib/view/pages/settings/data/default_settings.dart

@@ -3,6 +3,7 @@ import 'dart:io';
 import 'package:flutter/material.dart';
 
 import '../../../../state/app/modules/app_modules.dart';
+import '../../../../storage/chat_background_settings.dart';
 import '../../../../storage/dev_tools_settings.dart';
 import '../../../../storage/file_settings.dart';
 import '../../../../storage/file_view_settings.dart';
@@ -45,6 +46,15 @@ class DefaultSettings {
       drafts: {},
       draftReplies: {},
     ),
+    chatBackgroundSettings: ChatBackgroundSettings(
+      // Mirrors the previous hard-coded behaviour: tiled pattern, no effects.
+      type: ChatBackgroundType.pattern,
+      fit: ChatBackgroundFit.tile,
+      colorValue: null,
+      imageVersion: 0,
+      dim: 0,
+      blur: 0,
+    ),
     fileSettings: FileSettings(
       sortFoldersToTop: true,
       ascending: true,